[clang] [llvm] [BPF] Add load-acquire and store-release instructions under -mcpu=v4 (PR #108636)

[Peilin Ye via cfe-commits]

peilin-ye wrote:

> So your change looks good. Once you get some kernel work in reasonable shape, this patch can land. Thanks!

Sure, thanks for reviewing this!

https://github.com/llvm/llvm-project/pull/108636